Get the return type of the function

[xtreak via Digitalmars-d-learn]

On Wednesday, 3 February 2016 at 23:57:12 UTC, Ivan Kazmenko 
wrote:
> On Wednesday, 3 February 2016 at 22:09:37 UTC, sigod wrote:
>> On Wednesday, 3 February 2016 at 19:21:06 UTC, Meta wrote:
>>> Ah, I see. I'd like to test something; can you please change 
>>> `(a) => a * a` to
>>> `(int a) => a * a` and post the results?
>>
>> This works.
>>
>> http://dpaste.dzfl.pl/92c254ef6cf6
>
> Seems reasonable: `(int a) => a * a` has return type `int` but 
> just `(a) => a * a` does not yet know the type of `a`, and so 
> can not tell the return type.

Thanks for the reply. But the issue was about knowing the type of 
lambda in map. Most people won't enter the type of argument in a 
map. Is there a way to detect the return type will be non void. I 
don't need to know the type I just wanr to verify its not void. 
Yes * can be overloaded and can have different types based on the 
input having the overloaded operator implemented. I just want to 
check if the return type is not void.